Window channel balance

A quick learner from Oakland says:
I'm looking for four 21" and two 15" window channel balance.
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A quick learner from Oakland says:
I forgot to add that the nylon fitting footing looks to be 1.25 inches. If there are more pictures or other identifying markers please let me know.
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Emily from SWISCO responded:

Hello!

Thanks for reaching out to us. Based on what I see here, you have the Series 351 or Series 390 depending on the depth of the bottom fitting. Measure as shown in the image below to see which is the best match. We don't have a balance with a 1-1/4" deep shoe so you may want to double-check just to be safe. 

You will also need to refer to the stamp on the metal channel of your balances to determine what spring strength option to select. 

Comparison of the S351 and S390 balance shoes.
Comparison of the S351 and S390 balance shoes.

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